Speech quality evaluation of uneven level protected iLBC vocoder for narrow band MSK radio

  • Authors:

  • Shih-Kai Lee;Lu-Ping Keng

  • Affiliations:

  • Communications Engineering Department, Yuan Ze University, Chungli, Taoyuan, Taiwan;Communications Engineering Department, Yuan Ze University, Chungli, Taoyuan, Taiwan

  • Venue:
  • ICCOM'08 Proceedings of the 12th WSEAS international conference on Communications
  • Year:
  • 2008

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Abstract

iLBC (internet Low Bit-rate Codec) is widely used in VoIP (Voice over IP) applications. This paper is concerned with using iLBC in narrow band MSK (Minimum Shift Keying) wireless communication. Several ULP (Uneven Level Protection) schemes to protect different part of payloads are evaluated under AWGN (Additive White Gaussian Noise) channel. We utilize PESQ (Perceptual Evaluation of Speech Quality) to evaluate the perceptual speech quality. Simulation results show significant improvement of PESQ scores by using appropriate ULP strategies so that our proposed MSK radio system can achieve high receiving sensitivity.